human viewport parameters
You can change the view with this in the N panel:


Lens controls the field of view, start and end Clip control near and far.
For more control on left, right, bottom and top, you'll need to use a camera and change resolution. In viewport, it's display size.

for walk/fly mode, use shift+F. for parameters, in user prefs, input tab, view navigation : walk and gravity for a FPS like (WASD + V jump, space teleport) movement.


with gravity, you need a ground (plane or any object).